US 11,807,994 B2
Sound absorbing and insulating member and method for manufacturing the same
Makoto Segi, Kariya (JP)
Assigned to TOYOTA SHATAI KABUSHIKI KAISHA, Kariya (JP)
Appl. No. 17/265,767
Filed by TOYOTA SHATAI KABUSHIKI KAISHA, Kariya (JP)
PCT Filed Aug. 1, 2019, PCT No. PCT/JP2019/030182
§ 371(c)(1), (2) Date Feb. 3, 2021,
PCT Pub. No. WO2020/066286, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-179310 (JP), filed on Sep. 25, 2018.
Prior Publication US 2021/0292975 A1, Sep. 23, 2021
Int. Cl. D21J 7/00 (2006.01); B60R 13/08 (2006.01); D21H 21/20 (2006.01); D21J 3/10 (2006.01); G10K 11/162 (2006.01); G10K 11/172 (2006.01)
CPC D21J 7/00 (2013.01) [B60R 13/0861 (2013.01); D21H 21/20 (2013.01); D21J 3/10 (2013.01); G10K 11/162 (2013.01); G10K 11/172 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A manufacturing method of a sound absorbing and insulating member, wherein:
the sound absorbing and insulating member has a hollow protrusion and a communication part communicating an inside of the protrusion with and an outside of the protrusion;
a molding die for molding the sound absorbing and insulating member includes a molding surface having an outer shape corresponding to the protrusion, a net material arranged along the molding surface, and a liquid suction part opened in the molding surface; and
the molding surface has a recessed portion provided at a position where the communication part is formed, and a rod-like or plate-like projection portion projecting from a bottom of the recessed portion and passing through the net material,
the manufacturing method comprising:
a first step of immersing the molding die in a raw liquid including cellulosic fibers, and sucking liquid of the raw liquid through the net material by the liquid suction part so as to cause the cellulosic fibers to be laminated on the net material,
a second step of drying the cellulosic fibers laminated on the net material so as to form the protrusion, and drying the cellulosic fibers laminated on the recessed portion so as to form an outer shape of the communication part, and
a third step of removing the dried protrusion and the communication part from the molding die so as to communicate the inside of the protrusion with and the outside of the protrusion through a passage part of the communication part formed at a position where the projection portion was arranged.